22.

The marketing director of a department store conducted a survey of the store's customers to find out if consumers were influenced by the brand name when purchasing a good. Interviewers interviewed 10 different consumers each to get their reaction on this topic. These interviews were repeated over 10 days for a total of 100 samples of size n = 10. The table below summarizes the results of this survey (number of xi consumers among 10 influenced by the brand name and the number of samples). The table also gives you the preliminary calculations for the calculation of the theoretical frequencies for a proportion of 20%.

Number (of people (out of 10) who are influenced/ Observed frequency /Probability /Theoretical distribution (100'probability)